added RestartServlet, which is able to trigger a complete restart of the context

scm-webapp/src/test/java/sonia/scm/boot/RestartServletTest.java

@@ -0,0 +1,133 @@
+package sonia.scm.boot;
+
+import com.github.legman.Subscribe;
+import com.google.common.base.Charsets;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+import sonia.scm.Stage;
+import sonia.scm.event.ScmEventBus;
+import sonia.scm.event.ScmTestEventBus;
+
+import javax.servlet.ServletInputStream;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@RunWith(MockitoJUnitRunner.class)
+public class RestartServletTest {
+
+  @Mock
+  private HttpServletRequest request;
+
+  @Mock
+  private HttpServletResponse response;
+
+  private RestartServlet restartServlet;
+
+  private EventListener listener;
+
+  private void setUpObjectUnderTest(Stage stage) {
+    listener = new EventListener();
+    ScmEventBus eventBus = ScmTestEventBus.getInstance();
+    eventBus.register(listener);
+
+    restartServlet = new RestartServlet(eventBus, stage);
+  }
+
+  @Test
+  public void testRestart() throws IOException {
+    setUpObjectUnderTest(Stage.DEVELOPMENT);
+    setRequestInputReason("something changed");
+
+    restartServlet.doPost(request, response);
+
+    verify(response).setStatus(HttpServletResponse.SC_ACCEPTED);
+
+    RestartEvent restartEvent = listener.restartEvent;
+    assertThat(restartEvent).isNotNull();
+    assertThat(restartEvent.getCause()).isEqualTo(RestartServlet.class);
+    assertThat(restartEvent.getReason()).isEqualTo("something changed");
+  }
+
+  @Test
+  public void testRestartCalledTwice() throws IOException {
+    setUpObjectUnderTest(Stage.DEVELOPMENT);
+
+    setRequestInputReason("initial change");
+    restartServlet.doPost(request, response);
+    verify(response).setStatus(HttpServletResponse.SC_ACCEPTED);
+
+    setRequestInputReason("changed again");
+    restartServlet.doPost(request, response);
+    verify(response).setStatus(HttpServletResponse.SC_CONFLICT);
+  }
+
+  @Test
+  public void testRestartWithInvalidContent() throws IOException {
+    setUpObjectUnderTest(Stage.DEVELOPMENT);
+
+    setRequestInputContent("invalid json");
+
+    restartServlet.doPost(request, response);
+
+    verify(response).setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
+  }
+
+  @Test
+  public void testRestartInProductionStage() throws IOException {
+    setUpObjectUnderTest(Stage.PRODUCTION);
+
+    setRequestInputReason("initial change");
+
+    restartServlet.doPost(request, response);
+
+    verify(response).setStatus(HttpServletResponse.SC_NOT_ACCEPTABLE);
+  }
+
+  private void setRequestInputReason(String message) throws IOException {
+    String content = createReason(message);
+    setRequestInputContent(content);
+  }
+
+  private void setRequestInputContent(String content) throws IOException {
+    InputStream input = createReasonAsInputStream(content);
+    when(request.getInputStream()).thenReturn(createServletInputStream(input));
+  }
+
+  private ServletInputStream createServletInputStream(final InputStream inputStream) {
+    return new ServletInputStream() {
+      @Override
+      public int read() throws IOException {
+        return inputStream.read();
+      }
+    };
+  }
+
+  private InputStream createReasonAsInputStream(String content) {
+    return new ByteArrayInputStream(content.getBytes(Charsets.UTF_8));
+  }
+
+  private String createReason(String message) {
+    return String.format("{\"message\": \"%s\"}", message);
+  }
+
+  public static class EventListener {
+
+    private RestartEvent restartEvent;
+
+    @Subscribe(async = false)
+    public void store(RestartEvent restartEvent) {
+      this.restartEvent = restartEvent;
+    }
+
+  }
+}